Detachable handle saw



July 22, 1952 w. E. DERBY DETACHABLE HANDLE SAW 1 Filed ed. a. 1949 Patented July 22, 1952 OFFICE DETACHABLE HANDLE SAW William E. Derby, Philadelphia, Pa., assignor to Henry Disston and Sons, Inc., Philadelphia,. Pa., a corporation of Pennsylvania Application October 6, 1949, Serial No. 119,847 I "'2 Claims. (01. 145-31) 1 This invention relates to improvements in saws, primarily of the compass type, wherein provision is made for replacing the .bladein the handle or holder. 'i

A primary object of the invention is to provide a detachable blade and holder assembly of generally improved characteristics.

More particularly an object of the invention is to provide a saw of the stated type having improved means for detachably retaining the blade in the holder whereby substantially all looseness or play between the blade and the holder is eliminated/ Another object, of the invention is to provide an assembly of the character set forth in the preceding paragraph wherein the blade may be conveniently inserted and detached from the holder without the use of tools.

' The invention will be more readily understood by reference to the attached drawings wherein:

Fig. 1 is a side view of a saw made in accordance with the invention;

Fig. 2 is a fragmentary view in perspective of the saw blade;

Fig. 3 is a view in perspective of the blade holder; T

Figs. 4, 5 and 6 are fragmentary longitudinal sectional views illustrating various stages in the engagement and disengagement of the blade with and from the holder; and

Figs. 7, 8 and 9 are sectional views on the lines 1-1, 8-8 and 99, respectively, of Fig. 1.

With reference to the drawings, the particular blade therein illustrated has at one end a substantially rectangular base portion I having therein two longitudinally aligned apertures, 2 and 3 respectively, relatively spaced longitudinally of the blade, and, also aligned with the apertures 2 and 3, a recess 4 in the terminal end edge of the base portion I.

The blade holder 5, as shown in Fig. 3, is in the form in the present instance of a pistol-grip handle and has therein a slot like recess, designated generally by the reference numeral 6, for reception of the butt end I of the saw blade, said recess being proportioned to closely fit the butt so that the blade may be rigidly supported in the holder.

The slotted recess 6 is formed so that in assembling the blade in the holder the butt of the blade is inserted endwise. One side of the recess is defined by the surfaces 1 and 8 of relatively spaced portions 9 and i0, respectively, of the holder, said surfaces being in a common plane and forming a seat for one face of the butt I of the blade. The other side of the recess is de-' fined by the surface ll of a transverse portion I2 of the holder, said portion in the present instance being located intermediately of the portions 9 and I0 and. being arranged with-respect to the latter portions so that the surface I l is off-set from the common plane of the surfaces I and 8 to an extent corresponding substantially to the thickness of theblade as measured between the opposite facesof the latter. 7

Projecting from the surface 1 is a pin l3 which, inassembly, engages in the elongatedaperture 3 of the blade; and a second pin l4 projects similarly from the surface 8 of the portion In of the holder and in assembly is engaged with the blade aperture 2. It will be noted that the side of the pin [4 which faces the open end of the recess 6, i. e., the end throughwhich the blade is inserted and withdrawn, is inclined rearwardly from the common plane of the surfaces 1 and 8, this inclined surface of the pin being designated by the reference numeral l5. It will be noted also that the side of the pin l3 which confronts the open end of the recess 6 is inclined in the opposite direction so that this forward side of the pin I3 is in effect undercut, as illustrated at l6, Fig. {1. It is noted also that the holder is provided in the inner end of the recess 6 with a projecting lug II which in assembly is adapted to engage in and to more or less neatly fit the recess 4 of the blade.

In transverse dimensions that is the dimension between the sides I8 and I9 of the recess 6 the said recess conforms closely to the corresponding dimension of the butt portion I of the blade so that when the blade is inserted in the recess it fits nicely between the sides 18 and I9 of the recess.

In inserting the blade into the holder, the butt end thereof is inserted diagonally downward into the open end of the recess 6 between the transverse portions 9 and I2 of the holder to a position wherein pin l3 engages the rear portion of slot 3 in the blade, as illustrated in Figure 4. The blade is then adjusted angularly until the face of the blade lies flatly against the surface I of the portion 9 and surface II of the portion l2 as shown in broken lines in Figure 4. The position of slot 3 in relation to the terminal end of the blade is suchthat in this adjustmentthe terminal end of the blade clears the forward edge of portion Hi. In this position the terminal end Of the butt portion of the blade will confront the inclined surface l5 of the pin [4. Pressure is now exerted to force the blade inwardly of the recess thereby causing-the inner end of the blade to blade is thus securely locked in place within the holder. The pin H prevents displacement of the blade toward the outer end of the slot. The boss l1 functions to prevent lateral movement of the blade in its own plane and relieves th pin M of that function, and the overhang of pin I3pre-' vents movement of the blade away from the seating surface 1. The transverse portion 12 over- 4 portion thereof, a holder for said blade having an elongated recess openat its outer end to admit said end portion or the blade and having side walls confronting the respective side faces of the blade and spaced apart a distance to snugly embrace the said side faces and to confine the blade, said holder being provided internally of sa d e ssv ith two ns p ojec n He one of said side walls and spaced longitudinally of the lying the blade also prevents any movement of the v butt of the blade whichmight tend to free it from the pin [4.

While the blade is thus gheldrigidly and se curely in place in the holder it may be removed readilyby merely flexing the butt end of-"the blade away from the seating surface 8 to an ex-- tent, as illustrated in Fig. 6, freeing'the pin I l from the aperture 2. In this operation the mem-' ber it of the holder acts as a fulcrum around which the ilexure' of the blade occurs. When thus freed from the pin M the blade may be removed irom the holder by withdrawing it lon gitudinally from the recess 6 to the point'where the butt end of the blade passes the forward edge of the portion In of the holder. The blade is then adjusted angularly disengaging slot 3 in the blade from pin l3 after which the blade may readily be withdrawn. V

It will be noted that in this device the inclined forward side I5 01: the pin I l acts as a cam during the blade inserting operation to displace the inner butt end of the blade by flexure 'so as to permit longitudinal movement of the blade into the fully assembled position shown in Fig. 5.

recess so that'the said apertured end portion of the blade may fully occupy said recess unfiexed only when the saidpins have entered said apertures, said one side wallhaving an opening between said pins, and the opposite side Wall comprising ,atransverse band, and having openings at opposite sideslof said band, the openings of both side Walls having a transverse width in excess of the transverse dimension of the said end portion of the blade, and said transverse band being positioned to engage the proximate side tape 91? the blade intermediate the pins so as to afi d a. nilcri v bou wh c t e. n er nd po tion, of he b ade ma b fl x to m t th pin which adjoins the inner end of the holder recess to the corresponding aperture Of the blade and to subs quently el a t e b a e rg ai pin.

2. A tool according to claim 1 wherein the p ture of the blade which re e veshe n Which ad oins the outer vemloi t e ho de recess s eionga' ed lon itudinally of the b ade 110 permit the longi dinal mo em nt f the b ade i When thus fully seated lateral movement of the blade is positively precluded as described above as well as by the propinquity of the opposite longitudinal edges thereof with the side walls It, and [9 of the recess 6. I

Iclaim: V A l v 1.,A tool comprising a resilient blade having two longitudinally-spaced apertures in one end I operative re at ve with the recess req'uired for adjustment of the end portion of the blade after flexure into or out of he nne pin i li-1A DERBY- REFERENCES orren fihe following references are of record the fi of h s pa ent:

' UNITED STATES PATENTS Number Name Date 542,583 Ball 4 July 9,1895 2,016,107 Frosberg Oct. 1, 1935 2,017,895 Davy Oct. 22, 1935 2,137,800 Davy Nov. 2 2, 1,933 2,149,211 Davy Feb. 28, 1939' 2,2 2,902 Su tan e7 Mar 12, .1 2. 2,361,256 'Barland got. 24, 1944 

